MODELING HYBRID EMP SIMULATORS WITH GAP FEED LOCATIONS FAR FROM THE RF SOURCE C. Zuffada

I Recently a new hybrid EMP simtilator has been developed where the signal is transmitted by a high-quality coaxial cable from a RF source on the ground to a point above the ground where the cable is cut to create a gap source. The cable is made part of the antenna by passing it through chokes which provide a frequency dependent inductively coupled impedance, thus making the cable-shield exterior effectively loaded for exterior scattering purposes over a wide band of frequencies of interest. Two geomernes have been analyzed and practically implemented and a simple analytical model has been developed to make current and field predictions. Comparisons arc presented between measurements and calculations.